package com.nowcoder.community.service.impl;

import com.nowcoder.community.dao.LoginTicketMapper;
import com.nowcoder.community.dao.UserMapper;
import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.MailClient;
import com.nowcoder.community.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.util.*;
import java.util.concurrent.TimeUnit;

@Service
public class UserServiceImpl implements UserService, CommunityConstant {
    @Autowired
    private UserMapper userMapper;

    @Autowired
    private MailClient mailClient; // 邮件客户端

    @Autowired
    private TemplateEngine templateEngine; // 模板引擎

    @Autowired
    private RedisTemplate redisTemplate;

//    @Autowired
//    private LoginTicketMapper loginTicketMapper;

    @Value("${community.path.domain}") // 域名
    private String domain;

    @Value("${server.servlet.context-path}") // 项目名
    private String contextPath;

    @Override
    public User findUserById(int id) {
//        return userMapper.selectById(id);
        User user = getCache(id);
        if(user == null)
            user = initCache(id);
        return user;

    }

    // 注册业务，返回map类的状态信息 如帐号不能为空等，传入填写好的注册信息
    @Override
    public Map<String, Object> register(User user) {
        Map<String, Object> map = new HashMap<>();

        // 空值处理
        if(user == null){
            throw new IllegalArgumentException("参数不能为空");
        }
        if(StringUtils.isBlank(user.getUsername())){
            map.put("usernameMsg", "帐号不能为空!");
            return map;
        }
        if(StringUtils.isBlank(user.getPassword())){
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }
        if(StringUtils.isBlank(user.getEmail())){
            map.put("emailMsg", "邮箱不能为空!");
            return map;
        }

        // 验证帐号
        User u = userMapper.selectByName(user.getUsername());
        if(u != null){
            map.put("usernameMsg", "该账号已存在!");
            return map;
        }

        // 验证邮箱
        u = userMapper.selectByEmail(user.getEmail());
        if(u != null){
            map.put("emailMsg", "该邮箱已被注册!");
            return map;
        }

        // 注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0, 5));
        user.setPassword(CommunityUtil.md5(user.getPassword() + user.getSalt())); // 密码加盐后进行加密
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID()); // 激活码
        user.setHeaderUrl(String.format("http://images.nowcoder.com/head/%dt.png", new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

        // 给用户发送HTMP格式的激活邮件
        Context context = new Context(); // 调用thymeleaf中的context对象
        context.setVariable("email", user.getEmail());
        // http://localhost:8080/community/activation/用户id/激活码  激活路径
        String url = domain + contextPath + "/activation/" + user.getId() + "/" + user.getActivationCode();
        context.setVariable("url", url);
        String content = templateEngine.process("/mail/activation", context);
        mailClient.sendMail(user.getEmail(), "激活账号", content);

        return map;
    }

    /**
     * 激活方法
     */
    @Override
    public int activation(int userId, String code){
       User user = userMapper.selectById(userId);
       if(user.getStatus() == 1){
           return ACTIVATION_REPEAT;
       }else if(user.getActivationCode().equals(code)){
           userMapper.updateStatus(userId, 1);
           clearCache(userId);
           return ACTIVATION_SUCCESS;
       }else{
           return ACTIVATION_FAILURE;
       }
    }

    /**
     * 登陆操作
     * @param username 用户名
     * @param password 密码
     * @param expiredSeconds 多少秒后凭证过期
     * @return 一个状态
     */
    @Override
    public Map<String, Object> login(String username, String password, int expiredSeconds){
        Map<String, Object> map = new HashMap<>();

        // 空值处理
        if(StringUtils.isBlank(username)){
            map.put("usernameMsg", "帐号不能为空");
            return map;
        }
        if(StringUtils.isBlank(password)){
            map.put("passwordMsg", "密码不能为空");
            return map;
        }

        // 验证帐号
        User user = userMapper.selectByName(username);
        if(user == null){
            map.put("usernameMsg", "帐号不存在");
            return map;
        }
        // 验证状态
        if(user.getStatus() == 0){
            map.put("usernameMsg", "帐号未激活");
            return map;
        }
        // 验证状态
        password = CommunityUtil.md5(password + user.getSalt());
        if(!user.getPassword().equals(password)){
            map.put("passwordMsg", "密码不正确");
            return map;
        }

        // 生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds * 1000));

//        loginTicketMapper.insertLoginTicket(loginTicket);

        String redisKey = RedisKeyUtil.getTicketKey(loginTicket.getTicket());
        redisTemplate.opsForValue().set(redisKey, loginTicket); // redis自动把loginTicket对象序列化为一个json字符串

        map.put("ticket", loginTicket.getTicket());

        return map;
    }

    @Override
    public void logout(String ticket){
//        loginTicketMapper.updateStatus(ticket, 1);
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        LoginTicket loginTicket  = (LoginTicket) redisTemplate.opsForValue().get(redisKey);
        loginTicket.setStatus(1);
        redisTemplate.opsForValue().set(redisKey, loginTicket);

    }

    /**
     * 根据ticket查询LoginTicket
     * @param ticket 凭证
     * @return LoginTicket对象
     */
    @Override
    public LoginTicket findLoginTicket(String ticket){
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        return (LoginTicket) redisTemplate.opsForValue().get(redisKey);
//        return loginTicketMapper.selectByTicket(ticket);
    }

    @Override
    public int updateHeader(int userId, String headerUrl) {
//        return userMapper.updateHeader(userId, headerUrl);
        int rows = userMapper.updateHeader(userId, headerUrl);
        clearCache(userId);
        return rows;

    }

    @Override
    public User findUserByName(String username) {
        return userMapper.selectByName(username);
    }

    // 1、优先从缓存中取值
    private User getCache(int userId){
        String redisKey = RedisKeyUtil.getUserKey(userId);
        return (User) redisTemplate.opsForValue().get(redisKey);
    }
    // 2、取不到时初始化缓存数据
    private User initCache(int userId){
        User user = userMapper.selectById(userId);
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.opsForValue().set(redisKey, user, 3600, TimeUnit.SECONDS);
        return user;
    }
    // 3、数据变更时清除缓存数据
    private void clearCache(int userId){
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.delete(redisKey);
    }


    // 获取用户权限
    @Override
    public Collection<? extends GrantedAuthority> getAuthorities(int userId){
        User user = this.findUserById(userId);

        List<GrantedAuthority> list = new ArrayList<>();
        list.add(new GrantedAuthority() {
            @Override
            public String getAuthority() {
                switch (user.getType()){
                    case 0 : return AUTHORITY_USER;
                    case 1 : return AUTHORITY_ADMIN;
                    default: return AUTHORITY_MODERATOR;
                }
            }
        });

        return list;
    }
}















































